Device for manufacture of piston rings



Dec. 19, 1922.

J. M. NARS'H. D

DEVICE FOR MANUFACTURE OF PISTON RINGS.

FILED APR-4,1921.

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$25, WQM- M 5 Jame 0 fig 91$ Patented Dec. 19, 1922.

entree stares FATENT FFEQE.

JOSEPH M. NARSH, OF ST. LOUIS, MISSOURI, ASSIGNOR, BY MESNE ASSIGNMENTS, TO

INLAND PRODUCTS COMPANY, OF ST. LOUIS, MISSOURI, A CORPORATION OF MIS- SOURI.

DEVICE FOR MANUFACTURE OF PISTON RINGS.

Application filed April 4, 1921. Serial No. 458,342.

an improvement in the art of forming fin-' .ished surfaces on metallic piston rings.

Another ob ect of the invention is to provide an improved apparatus or machine for use in supporting and grinding. or otherwise finishing the peripheral surfaces of piston rings.

The present invention is useful in finishing piston rings. whether the rings be of the individually cast type. 01' whether the rings he of the type that are cut from pots. \Yhile the invention is useful for finishing any type of metallic piston ring. it is especially useful in finishing piston rings that have been cast individually. It is known that in casting piston rings individually. lugs or projections are formed on the rings. These lugs or projections are formed by the metal in the gates of the molds. so that when the rings areremoved from the molds. thev have integral projections comprising the material in the gates. This results from the fact that it is impracticable to pour into the moldsthe exact amount of molten metal required to form the rings. and from the further fact that it is necessary to fill the molds completely with metal sufficient to form the ring of proper thickness all around; so that irrespective of the position of the gates, projections are formed on the ring castings.

Heretofore the ring castings have been placed on arbors and supported thereon. while the rough outer surfaces of the rings were being ground or finished. The project-ions mentioned are usually on the inner peripheries of the ring castings. Such projections by contact with the peripheral surface of the arbor. hold the ring castings on the arbor eccentrically relative to the arbor, so that when the ring surfaces are ground, the rings are made thinner at some places than at others. This has resulted in a large waste of material and in the breaking of large numbers of rings does overcome the difiiculties mentioned. By

use of my present invention. a number of ring castings may be placed concentrically on an arbor without giving any attention whatever to the positions of the projections on the ring castings. By use of my present invention, the ring castings may be ground and finished rings may be produced of approximately uniform thickness all around without regard for the positions of the project-ions relative to the arbor.

For the attainment of the objects stated. as well as for the accomplishment of the advantages mentioned. and other objects and advantages hereinafter disclosed. I have re duced my invention to satisfactory form. as shown in the drawings. in which. v

Fig. l is an elevation showing the invention in connection with a grinding machine.

Fig. 2 is a sectional view on the line 22 of Fig. l.

Fig. 3 is a sectional view on the line 3-3 of Fig. 1.

Fig. l is a view showing an arbor arranged to be supported otherwise than that shown in Fig. 1.

Fig. 5 is a sectional view on the line 5-5 of Fig. l.

Fig. 6 is an end view of the arbor shown in Fig. at having the ring castings mounted thereon.

As shown in the drawings. my invention comprises an arbor 1 provided with a peripheral series of longitudinal ribs or vanes :2. This arbor is arranged to receive and support a considerable number of ring castings or ring blanks. 'hen the ring castings or blanks are mounted on the arbor. the outer edges or ends of the ribs or vanes 2 contact with the inner periphery of the ring castings or blanks. so that said castings or blanks are supported concentrically on the arbor. This will be readily understood by reference to the drawings. special reference being made to Fig. 3. inwhich it will be seen that the ring casting or blank A is supported concentrically upon the arbor with the lug or projection B on the casting between adjacentribs or vanes 2. Indeed. it is impossible for the lugs or projections B to bear against the outer edge or end of a vane or rib. the construction and dimensions being such that the ring castings can be placed on till the arbor only when the lugs or projections are between the ribs or vanes. It is immaterial whether the lugs or projections be located between any specific pair of ribs or YtlllQS.

In use a number of ring blanks or eastings are placed on the arbor in the manner described. and are supported thereon by a supporting member in the form of a plate 3 in connection with the arbor. similar plate 4 is clamped 'igainst the opposite end of the series of ring blanks by an appropriate clamping device which may consist of a nut 5. threaded on the arbor.

In the embodiment shown the arbor 2 is formed with an axial hole or opening extending throughout the length thereof. and arranged to receive a supporting member 6. The arbor and the supporting member 6 may be held from rotation relative to each other by any appropriate constrlu'tion. as by keys 7 carried by one of said parts and engaging: in grooves in the other part (Figs. 3 and 5): held in rigid connection with the support 6 by other appropriate construction.

As shown. the plate has a notch 8 of sufficient diameter and depth to permit the plate to be applied to the shaft concentri- 'ally. This plate 3 of less diameter than the diameter of the ring blanks or castings, so that the ring blanks or castings maybe ground and finished without contact of the plate 3 with the grinder. The plate 3 rests against a circumferential shoulder 9 on the support (3 and is thereby rigidly supported.

The plate it is formed similar to the plate having a notch 10 similar to the notch 8. Likewise, the plate 1' is of smaller diameter than the diameter of the r ng blanks or castings. so that the grinding disc does not contact therewith.

In the construction shown in Fig. 1. the support 6 is provided with a base 11 arranged to bear upon the table 12 of the grinding machine. The device may be held in different adjusted positions on the table relative to the grinder As shown. the device may be held on the table by retaining elements comprising bolts 13. supported in slots in the table and being capale of lateral adjustment. The heads of the bolts engage in grooves in the side walls of the slots. so that the bolts cannot be withdrawn therefrom. Arms l-t on the bolts extend over the base 11 and hold the ring supporting device in position. but permit said supporting device to be turned or rotated as required to grind properly the entire. peripheral surfaces of the rings.

The ring supporting device may be turned manually by means of a crank 16 or otherwise as desired. The upper end of the ring supporting device may be braced or. if desired. the arbor may be by a bifurcated arm 17, receiving the support (5 between the arms thereof. The arm 17 is pivotally carried by a support 18, mounted on the machine. The support 18 may be held in adjusted positions by bolts 19 passing through a slotted part.

In Fig. 4: the device is shown adapted to be supported otherwise than as shown in Fig. 1. In Fig. 4 the arbor support (3 is designedto be supported by chuck spindles D in the same Way that the work is usually supported in machines using such spindles.

In using the invention. the ring blanks or castings are assembled on the arbor and the arbor is placed in the machine as described. The grinder is placed in operation and the arbor is turned, as required, to grind the entire peripheral surfaces of the blanks or castings thereon. In this way all of the ring blanks may be ground evenly and uniformly, and made of very nearly the same radial thickness all around.

There is a relatively great saving of material as compared with previous operations and machines in which the projections B held the ring blanks or castings eccentrically upon the arbor. Since the ring blanks are ground to approximately uniform thickness all around, they are of the desired strength. They do not then break so easily and frequently as in the case of rings which are ground too thin at some point of their circumference. After the ring blanks have been finished as to their exteriorsurfaces. they may be removed from the arbor and the finishing of the rings may be completed. I

From the foregoing it is apparent that my invention satisfactorily accomplishes all of its intended objects and purposes. Itis also apparent that the specific construction and arrangement may be varied without departure from the principle of the invention.

I do not restrict myself. to unessential particulars, but what- I claim and desire to secure by Letters Patent is:

1. A device for supporting piston rings during the grinding of the peripheries of the rings. comprising an arbor, aseries of radial vanes or r bs on the arbor, extending longitudinally thereof. and arranged to contact with the inner peripheries of the rings placed thereon, and means for holding the rings rigidly on the arbor.

2. A device of the character and for the purpose described, comprising an arbor, a depression on the surface of the arbor extending longitudinally thereof to receive inwardly extending projections in connection with ring blanks placed on the arbor. and means for holding the ring blanks rigidly on the arbor.

3. A device for supporting cast ring blanks during the finishing of the periphsis eries of the blanks, comprising an arbor having a longitudinal channel or groove therein to receive inwardly extending projections on the cast ring blanks, means for holding the ring blanks rigid during the grinding thereof, means for supporting the arbor in position for grinding of the blanks, and means for rotating the arbor.

4:. A device for supporting ring blanks during the grinding of the peripheries thereof, comprising an arbor, a support extending axially through the arbor and being remov able therefrom, construction preventing the arbor from turning relative to the support, and means for engaging the support for holding the ring blanks on the arbor during the grinding of the peripheral surfaces of the blanks.

.5. A device for supporting individually cast piston rings during the grinding of the peripheral surfaces of the rings, comprising an arbor, having a groove or depression extending longitudinally thereof to receive the projections on thering blanks placed on the arbor, a support on which the arbor is remorabl) mounted, and means releasably engaging the support for holding the ring blanks rigid on the arbor.

(5. A device of the character and for the purpose described, comprising an arbor. a radial series of vanes or ribs in connection with the arbor, arranged to support ring blanks and to receive projections on the ring blanks between the vanes or ribs. and clamping means for securing the ring blanks on the arbor.

7. A device of the character mentioned, comprising an arbor, a series ol' radial vanes or ribs on the arbor, arranged to support ring blanks and to receive inward projections on the ring blanks between them, removable elements on the support for engaging the blanks to hold them on the arbor, means for cooperating with one of said elements to bind the ring blanks on the arbor, and a support on which the arbor is removably mounted.

JOSEPH M. NARSH. 

